Grinding or abrading machine



Feb. 27, 1934. A5BR|DGE 1,949,345

GRINDING OR ABRADING MACHINE Filed Feb. 21, 1933 2 Sheets-Sheet 1 mur 3 Feb. 27, 1934. ASBRmGE 1,949,345

GRINDING 0R ABRADING MACHINE Filed Feb. 21, 1933 2 Sheets-$11691.- 2

Patented Feb. 27, 1934 Company Limited, Broadheath, near Manchester, England, a British company Application February 21, 1933, Serial No. 657,909

LIITED STATES PATENT OFFICE In Great Britain March 8, 1932 1 Claim.

This invention has for its object to provide an improved construction of machine for grinding the bevelled seating surfaces of mushroom or poppet type valves of internal combustion engines.

According to the invention grinding and regulating wheels operate with their peripheral faces upon the seating surface of the valve being ground, the stem of which is placed in a swivelly adjustable part of a pivotally mounted work carrier adapted in its pivotal movements to traverse the seating surface of the valve across and parallel with the peripheral face of the regulating wheel and towards or away from the peripheral face of the grinding wheel the head of which is also swivelly adjustable, means being provided for pressing the valve in an axial direction to feed it on to the grinding wheel due to the pivotal movement of the work carrier, means limiting such axial movement and means limiting the pivotal movement of the work carrier.

Referring to the accompanying explanatory drawings:-

Figure 1 is a plan view illustrating a grinding machine constructed and arranged in one convenient form in accordance with this invention.

Figure 2 is a diagrammatic elevation of the operative parts looking upon the peripheral edge of the regulating wheel.

Figure 3 is a view similar to Figure 2' but looking upon the peripheral edge of the grinding wheel.

Figure 4 is part elevation and part sectional elevation of the valve carrier. 4 I

The same reference letters in the different views indicate the same parts.

it indicates the grinding wheel mounted upon a spindle driven by the belt pulley b. The head 0 carrying the grinding wheel spindle bearings can be adjusted in a circular direction upon a slide 11, studs 8 and elongated slots 1 determining the amount of such adjustment. The slide at can be traversed by turning a handle 9, across a lower slide it which is itself traversible on the machine bed i by turning the handle 7'. By the ad justing means indicated (namely 9', g and e, f) the peripheral face of the grinding wheel can be brought where desired for operating on a valve seating surface having any desired bevel.

It indicates the regulating wheel mounted on a spindle driven by a belt pulley m. The head it carrying the regulating wheel spindle bearings is adjustable upon a lower slide 0, by turning a handle 71 and the lower slide 0 is adjustable upon the machine bed iby turning the handle q. The

peripheral face of the regulating wheel must always be at right angles to the axis of the work carrier, as hereinafter referred to, and so no provision for swivel adjustment of the regulating wheel head is required.

The work carrier is carried in pivotal supports r at its base. The bottom portion 8 of the work carrier has a table like top to carry the upper part 7; in which the valve to be ground is actually mounted. Bolts u and curved slots 1; permit the upper part 22 to be swivel adjusted, i. e. in a circular direction, upon the lower part in order to ensure that whatever be the bevel angle of the valve seat being ground, the part of such seat which engages the regulating wheel will always be parallel to the peripheral face of the regulating wheel at the place of engagement and in addition the pivotal movement of the carrier will move the valve face across the regulating wheel face and not to or away from the latter.

The valve holder may comprise a bush or hollow arbor w and an adjustment stud a: which limits the extent to which the valve stem can be forced into the bush or arbor during the grinding operation. Upon the part if is mounted by means of parallel links 3/ one pair of which has a handle extension 2 thereon, a pusher 6 having an adjustable abutment stud '7 therein and a. floating presser member 8 adapted to engage the valve head 9 and apply feed pressure thereto. A stud 10 which screws into the lower part s of the work carrier passes through a fixed bracket 11 against which the head 12 of the stud can abut to limit the movement of the stud 10 and so of the work carrier under the pressure of the coil spring 13 coiled around the stud 10 and bearing at one end on the bracket 11 and at the other upon the part 3. The stud 10 serves therefore as a stop to limit the movement of the workpiece under spring pressure away from the grinding wheel a (see Figure 2) and the bracket 11 serves as a stop to limit the movement of the work carrier towards the grinding wheel, for the part s abuts against 11 at the end 01' its pivotal movement.

In using the improved machine, the part it of the work carrier is set by its swivel adjustment in accordance with the angle of bevel of the valves to be ground. The grinding head is also set in accordance with its swivel adjustment to suit the bevel angle. The other adjustments of the grinding and regulating wheels are to suit the valve dimensions. The stop :1: on the work carrier is adjusted to suit the finished overall length of the valve and then the grinding operation commences, the handle a imposing the necessary pressure on the valve to give the desired rate of feed onto the grinding wheel, the valve moving across or parallel with the regulating wheel due to the disposition of the pivotal axis of the work carrier. When the valve stem comes against the stop a: and the work carrier part s against the stop 11, the grinding operation is completed.

With my improvement, I am enabled to deal expeditiously with valves having difierent bevel angles.

I may vary the means for mounting the valves in the work carrier to suit the types of valve and any peculiarity in their construction, such as where a valve has an enlarged part upon the valve stem which would not pass into a plain arbor but would require suitable holding down means.

What I claim is:

In grinding or abrading machines for the bevelled seating surfaces of mushroom or poppet type valves, in combination, a grinding wheel operating on its peripheral face, a regulating Wheel also operating on its peripheral face, a swivelly adjustable grinding wheel head, a pivotally mounted work carrier adapted in its pivotal movements to traverse the seating surface of the valve being ground across and parallel with the peripheral face of the regulating wheel and towards or away from the peripheral face of the grinding wheel, said pivotally mounted work carrier having a part in which the valve is mounted, means for the swivel adjustment of said part, means for pressing the valve in an axial direction whereby it is fed on to the grinding wheel due to the pivotal movement of the work carrier, means limiting such axial movement and means limiting the pivotal movement of the work carrier.

HARRY HALES ASBRIDGE 

